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checked the elevation, highest is around 2400 m + (about 7800 feet only), Is it because the Gps units are designed for land/marine only? normal altitude for these flights maybe around from 25K feet to 30K feet?

checked the elevation, highest is around 2400 m + (about 7800 feet only), Is it because the Gps units are designed for land/marine only? normal altitude for these flights maybe around from 25K feet to 30K feet?

Thanks jspalaroan, Yes you are right, the pilot said that we are cruising @ 33000 feet. That should be 10000 meters.

This is due to the fact that the GPS is actually measuring the barometric pressure and not the actual elevation. Since the Jetliner is pressurized, the value that is being read is the inside pressure of the jet and not the actual outside pressure.